Fix linting errors across backend and frontend

Backend: auto-fix and format all ruff issues, manually fix B904/B023/
SIM117/B007/E741/F841 errors, suppress B008 (FastAPI Depends) and F821
(SQLAlchemy forward refs) in config. Frontend: allow constant exports,
disable React compiler-specific rules (set-state-in-effect,
preserve-manual-memoization).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/src/app/models/route.py

@@ -7,7 +7,9 @@ from app.core.database import Base
 class Route(Base):
     __tablename__ = "routes"
     __table_args__ = (
-        UniqueConstraint("version_group_id", "name", name="uq_routes_version_group_name"),
+        UniqueConstraint(
+            "version_group_id", "name", name="uq_routes_version_group_name"
+        ),
     )
 
     id: Mapped[int] = mapped_column(primary_key=True)